8th Ed. Krox in 8th

been playin a bit of 8th, been running a 6 man team of krox, 3x2, the unit is good, been hittin hard when it is set up well, however been slack when faced with a real pitch battle, i am thinkin of settin it up 4x2 or even investing in a 4x3, just wonderin what the ancients think, to give some context-krox is one of 3 breaker units, playin around 2500, includes krox, saurus cav and carno, help or insight is appreciated

Kroxigor: Lots of Strength 7 attacks will rip apart any enemy…provided you can keep the Kroxigor alive long enough to let them strike. To keep them alive you need to give them adequate flank support and strategic buff spells. To get maximum use out of Kroxigor, you want to get your Kroxigor into combat with small numbers of powerful enemies: cavalry, chariots, monsters, and/or monstrous cavalry, especially Monsters. If they get bogged down fighting infantry, they will usually lose. Core infantry will mean your S7 attacks will go to waste. Elite Infantry will cut down your Kroxigors before they can even strike. Never forget to issue challenges A Kroxigor Ancient has a better chance of winning an underdog challenge than almost any other unit champion in all of Warhammer.